2nd International ICST Conference on Immersive Telecommunications

Research Article

Intra-frame depth image compression based on anisotropic partition scheme and plane approximation

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  • @INPROCEEDINGS{10.4108/immerscom.2009.15,
        author={Nikolay Ponomarenko and Vladimir Lukin and Atanas Gotchev and Karen Egiazarian},
        title={Intra-frame depth image compression based on anisotropic partition scheme and plane approximation},
        proceedings={2nd International ICST Conference on Immersive Telecommunications},
        publisher={ICST},
        proceedings_a={IMMERSCOM},
        year={2010},
        month={5},
        keywords={Depth image lossy compression intra-frame partition scheme},
        doi={10.4108/immerscom.2009.15}
    }
    
  • Nikolay Ponomarenko
    Vladimir Lukin
    Atanas Gotchev
    Karen Egiazarian
    Year: 2010
    Intra-frame depth image compression based on anisotropic partition scheme and plane approximation
    IMMERSCOM
    ICST
    DOI: 10.4108/immerscom.2009.15
Nikolay Ponomarenko1,*, Vladimir Lukin1,*, Atanas Gotchev2,*, Karen Egiazarian2,*
  • 1: National Aerospace University, 17 Chkalova Str., 61070 Kharkov, Ukraine
  • 2: Tampere University of Technology, Korkeakoulunkatu 1, 33720 Tampere, Finland
*Contact email: uagames@mail.ru, lukin@ai.kharkov.com, atanas.gotchev@tut.fi, karen.egiazarian@tut.fi

Abstract

3D video can be represented by color 2D video sequence accompanied by gray-scale dense depth map (depth image) sequence. In this paper, we describe a novel method for intraframe compression of the depth modality of such representation. Our method takes into account specific features of depth images, i.e. the presence of large smooth regions delineated by sharp discontinuities (edges). For such images, conventional transform-based coders produce undesirable artifacts which impede the subsequent rendering of virtual views. Instead of block transforms, the proposed method employs horizontal-vertical anisotropic partition scheme which yields a tree-structured decomposition of non-overlapping rectangular blocks adapted to the depth map content. Each block in the decomposition is approximated by plane described by the block corner pixels. The codestream consists of the coded partition scheme and the coded error of prediction of quantized corner pixels. The scheme substantially reduces the amount of artifacts around edges and yields an improvement of several dB in PSNR for typical compression ratios compared with the best transform-based coders. Other advantages of the designed coder are its simplicity and fast decompression, and the possibility to control the ratedistortion performance.